之前處理鍵盤(pán)遮擋問(wèn)題都是在每一個(gè)控制器進(jìn)行單獨(dú)處理，這樣做真的是非常的費(fèi)事，今天在做項(xiàng)目的時(shí)候就想到自己封裝一個(gè)，記錄一下這個(gè)“跌宕起伏”的過(guò)程。

　　思路是這樣的：計(jì)算文本編輯控件Frame與鍵盤(pán)Frame，如果遮擋則移動(dòng)控制器View。

　　創(chuàng)建控制器類(lèi)：WKAvoidKeyboardViewController

　　

1 #import <UIKit/UIKit.h> 2 3 @interface WKAvoidKeyboardViewController : UIViewController 4 5 @property (nonatomic, strong) UITextField *editTextField; 6 @property (nonatomic, strong) UITextView *editTextView; 7 8 - (void)hideKeyboard:(NSNotification *)noti; 9 - (void)showKeyboard:(NSNotification *)noti; 10 11 12 @end 13 14 15 #import "WKAvoidKeyboardViewController.h" 16 17 #define GetOSVersion [[UIDevice currentDevice].systemVersion floatValue] 18 19 #define GetTransformDistance(Distance) (GetOSVersion < 7.1 ? Distance / 2 : Distance) 20 21 @interface WKAvoidKeyboardViewController ()<UITextFieldDelegate, UITextViewDelegate> 22 23 @end 24 25 @implementation WKAvoidKeyboardViewController 26 - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 27 { 28 [self.view endEditing:YES]; 29 } 30 @end

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　　步驟1：通過(guò)通知獲取當(dāng)前編輯的文本控件

//注冊(cè)通知[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(showKeyboard:) name:UIKeyboardWillShowNotification object:nil];[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(hideKeyboard:) name:UIKeyboardWillHideNotification object:nil];[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textFieldBeginEditing:) name:UITextFieldTextDidBeginEditingNotification object:nil]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textFieldBeginEditing:) name:UITextViewTextDidBeginEditingNotification object:nil]; - (void)textFieldBeginEditing:(NSNotification *)noti {self.editTextField = noti.object;self.editTextView = nil; } - (void)textViewBeginEditing:(NSNotification *)noti {self.editTextView = noti.object;self.editTextField = nil; }

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　　步驟2：通知獲取鍵盤(pán)高度

　　步驟3：計(jì)算是否需要移動(dòng)

　　

#pragma mark - 鍵盤(pán)躲避- (void)showKeyboard:(NSNotification *)noti {self.view.transform = CGAffineTransformIdentity;UIView *editView = _editTextView ? _editTextView : _editTextField;CGRect tfRect = [editView.superview convertRect:editView.frame toView:self.view];NSValue *value = noti.userInfo[@"UIKeyboardFrameEndUserInfoKey"];NSLog(@"%@", value);CGRect keyBoardF = [value CGRectValue];CGFloat animationTime = [noti.userInfo[@"UIKeyboardAnimationDurationUserInfoKey"] floatValue];CGFloat _editMaxY = CGRectGetMaxY(tfRect);CGFloat _keyBoardMinY = CGRectGetMinY(keyBoardF);NSLog(@"%f %f", _editMaxY, _keyBoardMinY);if (_keyBoardMinY < _editMaxY) {CGFloat moveDistance = _editMaxY - _keyBoardMinY;[UIView animateWithDuration:animationTime animations:^{self.view.transform = CGAffineTransformTranslate(self.view.transform, 0, -moveDistance);}];} }- (void)hideKeyboard:(NSNotification *)noti {// NSLog(@"%@", noti);self.view.transform = CGAffineTransformIdentity; }

　　初步試驗(yàn)：UITextFiled成功，然后到了UITextView，坑爹的問(wèn)題粗線(xiàn)了=.=，?UITextViewTextDidBeginEditingNotification 發(fā)送時(shí)間是在鍵盤(pán)彈出通知之后的，導(dǎo)致第一次點(diǎn)擊TextView沒(méi)有用，點(diǎn)擊第二次才能產(chǎn)生效果。于是乎，我又開(kāi)始嘗試用TextView的Delegate來(lái)做，想當(dāng)然的使用的代理方法

- (void)textViewDidBeginEditing:(UITextView *)textView

1 - (void)textViewDidBeginEditing:(UITextView *)textView 2 { 3 4 }

　　令人失望的是textViewDidBeginEditing:方法調(diào)用依然是在鍵盤(pán)通知彈出后再調(diào)用，此時(shí)心中想的是：嗶了狗了，讓人怎么玩！還是看看其他方法吧。于是在代理方法中看到了

- (BOOL)textViewShouldBeginEditing:(UITextView *)textView

　　嘗試之后，此方法的確在鍵盤(pán)彈出前調(diào)用，大功告成，接下來(lái)就是設(shè)置代理的問(wèn)題了

　　設(shè)置代理方法如下：

1 - (void)searchTextViewWithView:(UIView *)view 2 { 3 for (UIView *subview in view.subviews) 4 { 5 if ([subview isKindOfClass:[UITextView class]]) { 6 ((UITextView *)subview).delegate = self; 7 } 8 if ([subview isKindOfClass:[UITextField class]]) { 9 ((UITextField *)subview).delegate = self; 10 } 11 [self searchTextViewWithView:subview]; 12 } 13 }

　　至此大功告成,使用方法：繼承WKAvoidKeyboardViewController,如果是用故事版創(chuàng)建的文本控件，啥都不用做，如果是用代碼創(chuàng)建的，則需要在ViewDidLoad中調(diào)用searchTextViewWithView方法

　　完整代碼下載地址：https://github.com/WuKongCoo1/AvoidKeyboardDemo.git

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轉(zhuǎn)載于:https://www.cnblogs.com/pretty-guy/p/4794002.html

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